JP4174467B2 - Image display method in video game machine - Google Patents

Description

  The present invention relates to an image display method in a video game machine.

In video game devices, multiple polygon models with different numbers of decomposition have been prepared, and models with a large number of polygons are displayed when they are displayed close to the camera, and polygons are displayed when they are displayed far from the camera. A method of ensuring the maximum appearance with the minimum processing has been used by displaying a model with few.
In addition, when a plurality of polygon models having different numbers of decompositions are used, the memory is compressed, so that the same polygon model is always displayed regardless of the distance from the camera.
JP 2000-57371 A JP 7-37119 A

The method using many types of polygon models with different numbers of decomposition has the disadvantage of compressing memory, and the method of always displaying the same polygon model has the disadvantage of poor appearance.
The present invention has been made in view of the above-described problems, and has as its main object to improve the appearance while using the memory to the limit.

To this end, an image display method in a video game device according to the invention of claim 1, divides the display object into a plurality of parts, in the image display method in each video game apparatus for displaying a polygon model, a plurality Selecting a part whose polygon decomposition number is to be changed among the parts (S1), checking a memory amount which is increased or decreased when the polygon decomposition number is changed (S6),
And a step (S8) of changing the polygon decomposition number only when a necessary amount of memory is available .
According to a second aspect of the present invention, there is provided an image display method for a video game device according to the first aspect, wherein the memory usage amount or the remaining memory amount is displayed when the memory amount that increases or decreases when the polygon decomposition number is changed is checked. To do.

  As described above, according to the image display method in the video game device of the present invention, it is possible to improve the appearance while using the memory to the limit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiment, the case where the present invention is applied to a video game machine is taken as an example.

  FIG. 1 is a block connection diagram showing an embodiment of an image display method in a video game machine according to the present invention.

  In FIG. 1, an image display method in a video game machine is composed of an operation device 2, a monitor 3, and a speaker 5 with a main device 1 as a center. The operation device 2 is a device operated by a player such as a joystick, a button, or a switch. The monitor 3 displays the image output signal of the main device 1 as a visible image. The speaker 5 converts the audio output signal of the main device 1 (sound system circuit 16) into an audible sound and outputs it.

  The main device 1 includes an input / output control circuit 6, a CPU circuit 7, a video control circuit 11, a screen memory 14, a sound system circuit 16, and the like. The input / output control circuit 6 detects a state in which the player has operated a joystick, a button, a switch or the like (the operation device 2) and transmits it to the CPU circuit 7. Transmission / reception of signals to / from the CPU circuit 7 is performed via the system bus 8. The work memory 9 is used as a work area for the CPU circuit 7. The program memory 10 stores a program for the CPU circuit 7.

  When the CPU circuit 7 outputs an image, the image data is written into the screen memory 14 via the video control circuit 11 and the video bus 13. The monitor 3 displays the image data written in the screen memory 14 as a visible image. The player operates the operating device 2 while watching the visible image on the monitor 3 to advance the game.

  When the CPU circuit 7 outputs sound, the sound data is output to the sound system circuit 16 via the dual port RAM 15. The sound system circuit 16 performs audio signal processing, generates an analog audio output signal, and outputs it to the speaker 5. The speaker 5 outputs the sound output signal of the sound system circuit 16 as an audible sound. The player operates the operating device 2 while listening to the sound output from the speaker 5 to advance the game.

  FIG. 1 shows a video game device that displays a display object divided into a plurality of parts. As shown in FIG. 3, a doll that is a display object has a head, arms, legs, torso, etc. It is displayed by dividing it into multiple parts.

  FIG. 2 is a flowchart showing a subroutine of a program of the CPU circuit 7, which is called from a main routine (not shown) and starts. That is, the process starts by selecting the polygon decomposition number from the visible image (part menu shown on the left side) of the monitor 3 shown in FIG. This program constitutes a part of a role-playing game in which a player (player) creates a character by hand, and the drawn character becomes a hero.

  When the program starts, first, in step S1, a part to be changed is selected. In step S2, the content to be changed (for example, color, polygon decomposition number, display erase, deletion, transfer, role, shape) is selected. When the polygon decomposition number is selected in step S2, the process proceeds to step S3. In step S3, a polygon decomposition number setting screen is displayed. The polygon decomposition number setting screen may be a decomposition number setting slide bar displayed in the polygon decomposition number menu, for example, as shown in FIG. By setting the number of disassembly high for parts that are important for appearance such as the face, and setting the number of disassembly low for parts that are not important for appearance such as a distant view or body, the maximum appearance can be secured with a small amount of memory usage.

  The player sets the polygon decomposition number by operating the operation device 2 and moving the slide bar left and right. In step S4, it is determined whether or not the setting of the polygon decomposition number has been completed. If it is determined that the process has not been completed, the process proceeds to step S5. In step S5, it is determined whether or not to change the polygon decomposition number. If not changed, the process returns to step S3. The process proceeds to step S6. In step S6, the size of the work memory 9 that increases or decreases when the polygon decomposition number is changed is checked. The result of checking the memory size is displayed at the lower right of the monitor 3 as shown in FIG. Here, the total usable amount and the remaining amount are displayed in a bar graph form.

  If it is determined in step S6 that the work memory 9 does not have enough available memory, a message indicating that the number of decomposition cannot be changed is displayed in step S7, and then the process returns to step S3 to prompt the resetting of the polygon decomposition number. When it is determined that the work memory 9 has the necessary memory capacity (step S8), the polygon decomposition number of the selected part is set and displayed on the monitor 3 as a visible image. The visible image displayed on the monitor 3 changes according to the polygon decomposition number, for example, as shown in FIG.

  FIG. 4 shows a state in which the polygon division number is dynamically changed by setting the division degree parameter when creating the model from the outer periphery information. In this specification, the polygon decomposition number is used in the same meaning as the polygon number shown in FIG. When the perimeter information of the model is 8 vertices, the memory usage is zero because it is not a solid. When the model perimeter information is rough polygon division with 10 vertices and 10 polygons, the memory usage is small. When the model periphery information is fine polygon division with 14 vertices and 18 polygons, the memory usage is medium. When the model periphery information is finer polygon division with 23 vertices and 36 polygons, the memory usage is large.

  For each vertex, information on the vertex position xyz coordinate and the xyz coordinate in the normal direction is required. Also, connection information for 3 points is required per polygon. Assuming that the coordinate information is 16 bytes each and the connection information per point is 4 bytes, if the number of vertices is 10 and the number of polygons is 10, the number of vertices 10 x 16 bytes x 6 types = 960 bytes, the number of polygons 10 × 4 bytes × 3 points = 120 bytes, which is a total memory usage of 1080 bytes. When the number of vertices is 14 and the number of polygons is 18, the number of vertices is 14 × 16 bytes × 6 types = 1344 bytes, the number of polygons is 18 × 4 bytes × 3 points = 216 bytes, and the total memory usage is 1560 bytes. When the number of vertices is 23 and the number of polygons is 36, the number of vertices is 23 × 16 bytes × 6 types = 2208 bytes, the number of polygons is 36 × 4 bytes × 3 points = 432 bytes, and the total memory usage is 2640 bytes.

  FIG. 5 shows a change in memory usage when the number of disassembly of the body parts is left unchanged and only the head part that emphasizes appearance is set to a fine disassembly number. That is, when the number of vertices is 13 and the number of polygons is 15, the total memory usage is 1428 bytes. When the number of vertices is 26 and the number of polygons is 41, the total memory usage is 2988 bytes.

  The present invention presents a technology that can be used by manufacturers of home game machines.

It is a block connection diagram which shows the image display method in a video game device. Example 1 It is a flowchart which shows the implementation method of the image display method in a video game device. Example 1 It is a front view which shows the implementation method of the image display method in a video game device. Example 1 It is a conceptual diagram which shows the implementation method of the image display method in a video game device. Example 1 It is a conceptual diagram which shows the implementation method of the image display method in a video game device. Example 1

Explanation of symbols

2 Operation Device 3 Monitor 4 Main Device 5 Speaker 6 Input / Output Control Circuit 7 CPU Circuit 8 System Bus 9 Work Memory 10 Program Memory 11 Video Control Circuit 13 Video Bus 14 Screen Memory 15 Dual Port RAM
16 Sound system circuit

Claims (2)

In an image display method in a video game device that divides a display object into a plurality of parts and displays each as a polygon model ,
Selecting a part for changing the polygon decomposition number among the plurality of parts (S1);
Checking the amount of memory that increases or decreases when the polygon decomposition number is changed (S6);
And a step (S8) of changing the polygon decomposition number only when a necessary amount of memory is available . When checking the amount of memory that increases or decreases when the polygon decomposition number is changed ,
2. The image display method for a video game device according to claim 1, wherein the memory usage amount or the remaining memory amount is displayed.

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